Wearelivinginanage     QRcodes（二維碼）arebecomingmoreandmo...

問題詳情：

We are living in an age      QR codes（二維碼）are becoming more and more popular in our daily life.

A. why    B. that

C. whose    D. when

【回答】

D

知識點：連詞

題型：選擇題